Grant has revealed that she plans to write a book called 'The Diary of Princess Pushy's Sister' which will include her memories of growing up with Meghan, 35, and 'deal with my bi-racial family in a candid, warm, personal and socially important way'.

But Rasmussen, an anthropology student, says Grant loathes Meghan, who has been dating Prince Harry since May 2016, and has spent years telling the rest of the family that she doesn't want her around.

She and her mother are estranged and Rasmussen also accuses her mother of abusing her.

Family: Noelle Rasmussen is the niece of Meghan Markle, whose half-sister Samantha Grant is her mother. But she is estranged from her mother, and says that Grant's announcement she is writing a book on being sister to 'princess pushy' is motivated by hatred

Not close: Samantha Grant and Meghan Markle are sisters through their father, Thomas Markle. But Grant has repeatedly accused the actress of not being supportive of her

She told DailyMail.com: 'When [Meghan] started dating Prince Harry, [Grant] got an interest in Meghan which she had never had before.

'She wanted to be nice, to be friends, to say how much she loves her sister – but after years of telling me and the rest of the family how much she hates Meghan, how much of a narcissist Meghan apparently is and what a horrible woman Meghan is, which isn't true at all.'

Rasmussen said her mother's dislike of her sister had been apparent for much of her life.

'Of course my mother doesn't like Meghan. This she's told me starting from a very early age,' she said.

'She hasn't liked Meghan since essentially she was born. She's told me stories about how she didn't want her around and how she never asked for Meghan.

'She's just been overall jealous of Meghan as soon as she got famous and began taking jobs like, for example, [Beverly Hills] 90210. And of course, when she got Suits, that set her off.

'After however many years, she's just completely bashed Meghan, said the most horrible things about her to the entire family, and just been completely jealous of her.

'She hasn't shown her any type of love or appreciation unless she wants money. That's it.'

Grant's claim that she will write a book about her relationship with Markle earned a withering response from her own daughter.

'It's not a tell all book if it's all lies,' she said.

'You can essentially write a book full of lies but it's not a tell all. It's literally just going to be her versions, her ramblings, of things that have happened. None of it is going to be true.'

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Rasmussen also claims her mother was an abusive parent who beat her and pulled her out of school at the age of 15.

She further claims to have suffered at the hands of her mother's convicted criminal boyfriend Mark Phillips, 59, who moved in when Noel was 13.

Rasmussen said: 'She [would say] if it's not bleeding and there's nothing broken, there's no abuse. That's her way of justifying it.'

The teenager began living with her father Scott Rasmussen, 57, of Albuquerque, New Mexico, shortly before her 17th birthday, was born in October 1998 and her parents split five years later.

Following a bitter divorce in 2003, Grant was given custody of the little girl but, claims Rasmussen, made her life a misery from the start.

She said: 'I can't remember the younger years but I'm assuming [the abuse] was pretty much since I was one or two.

'I do remember one [incident] – it was when I was very young, maybe about four or five. She had gotten very upset about something; I forget what it was but she picked me up by the arm and threw me into a wall.

'A few other incidents I remember – probably when I was nine or ten - I would get scratched, spat at, hair pulled, that sort of thing.

'This was something she did fairly often. It was more of an everyday thing. My grandmother Roslyn, she would take me to school in elementary and middle school, and she remembers me being screamed at and that type of thing. She would see this every day.'

Family: Meghan Markle's father, Thomas Markle (left, with her as a child) was already father to Thomas Jr and Samantha when he married Doria Ragland (right) and became father to Meghan. The couple have since divorced

Abuse claims: Samantha Grant now lives in Florida with her partner Mark Phillips. Documents show claims of domestic abuse. Her daughter Noel Rasmussen tells DailyMail.com she was abused by Grant

Roslyn Markle, 71, is the first wife of Meghan's father Thomas Sr, 72, of Los Angeles, California, and the mother of his eldest two children – Grant and Thomas Jr, 50.

Meghan is Thomas Sr's daughter from his second marriage to yoga teacher Doria Ragland, 60.

Roslyn said: 'I remember one morning, Noel was sitting at the table eating breakfast and she had a pair of her shoes in the middle of the living room, and Samantha started screaming at her to get her f***ing shoes out of the middle of the floor.

'I made the comment, let her eat her breakfast, she can pick up her shoes later. That was the start of a tirade. I want her f***ing shoes out of the middle of the floor right now and I don't care if she's eating breakfast.'

Rasmussen claims the physical abuse stopped when she was in her early teens and Grant was diagnosed with multiple sclerosis and was forced to begin using a wheelchair.

But, she says, the verbal abuse continued – and worsened after Phillips came into their lives.

Noel said: 'She had been talking to Mark Phillips for maybe a month or so and I [got] home from school one day and there's this guy just hanging out.

She is a very, very nice person – very sweet, very genuine. She is nothing like my mother. She is actually the complete opposite – she is just a great, great woman

Noel Rasmussen on Meghan Markle

'I'm like, OK, who is this guy? And she was like, this is Mark – he's going to be living with us now. She eventually told me she had met him on Facebook, started talking and just decided to move him in.'

Phillips, who works clearing storage units, has a string of arrests, warrants and criminal charges spanning four different states – California, Florida, Massachusetts and Washington.

Records seen by DailyMail.com show his brushes with law enforcement stretch back to a series of arrests in 1977 in Massachusetts, and include charges in Miami, Florida, in 1982.

According to Noel, Phillips seemed kind and pleasant for the first month but says he quickly became abusive, both to her and her mother.

She said: 'I was more scared of him [than Grant], honestly. He threatened to stab me once. We were in line in Walmart and he realizes he's forgotten ice.

'He's standing a foot or so from the ice machine – he asks me to go round him and get it. I can't go round him just because of how he's positioned and so I ask him, so can you please get it? I can't get around you.

'And so, he just blows up at that point. He just starts going on about how when we leave, I'm going to get it, I'm going to get stabbed, he was going to pull a knife on me.

'He wanted to fight me when we got home. He wanted to fight a 15-year-old girl. Which I thought was kind of ridiculous.'

Phillips denies the stabbing threat. He alleges that Noel herself is unstable and an unreliable witness who has made untrue claims in the past.

Matters finally came to a head following a three-day argument with Phillips in March 2015, after which, Noel claims, her mother threw her out.

She said: 'There was a fight that had happened – I can't remember what it was over but it was over three, maybe four days.

'It was just constant, constant anger [from Phillips] towards me and my mom. Eventually, my mom just said, well I'm not going to keep both you and Mark in the same house and I'm not making Mark leave, so that left me to leave.'

Noel then moved in with her father Scott, a film industry armorer – at which point both he and Grant began an extended custody wrangle over their daughter.

Both took out restraining orders against the other and repeatedly called the police over alleged violations between May 2015 and May 2016.

Family: Noel Rasmussen (right) now lives with her grandmother Rosyln Markle. Both women are estranged from Samantha Grant. Her daughter says Grant is motivated by jealousy

Abuse claims: DailyMail.com has seen documents showing how the police dealt with Rasmussen's allegations against her mother

Noel says relations between her parents became so bad, she and her father were forced to ask the police to help them retrieve her possessions. Her account matches a police report seen by DailyMail.com.

Dated June 29 2015, it says that Scott and Noel went to Grant's home to collect her things accompanied by officers, although that was not enough to stop her from calling the police.

During the custody battle, which ended with Noel's 18th birthday in October last year, Phillips was accused of harassing Noel with abusive text messages, which have been seen by DailyMail.com.

In them, he calls her a liar and adds: 'Perjury is a serious charge and you will not lie or you will be charged and granny as well.'

Another incident involving Phillips took place on July 29 2015 when he was accused of being abusive to Noel inside court, according to an affidavit filed by Scott.

According to documents seen by DailyMail.com, Phillips shouted: 'Stupid f***ing b***h' at the 18-year-old as she passed him in the corridor.

Mother and daughter are now estranged, although Rasmussen says she is concerned that Phillips might one day hurt Gran.

Police records from New Mexico show that police were called to a domestic violence incident at the couple's home shortly before they relocated to Florida where they now live.

Rasmussen says she now wants to get on with her life without input from her mother but wishes her aunt Meghan all the best – and says she hopes Prince Harry will make her happy.

She said: 'She is a very, very nice person – very sweet, very genuine. She is nothing like my mother. She is actually the complete opposite – she is just a great, great woman.

'I remember her being very friendly, very open. She's funny. I'm sure she will make Prince Harry happy and I hope he does the same for her because she's just such a wonderful woman.

Noel added: 'I hope Meghan has a really good life. If she doesn't end up with Prince Harry, I hope she ends up with someone equally as great who makes her just as happy as she makes them.'